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Jump Start of Vehicle Battery

Connecting an External Battery Using Jump Leads

IF THE BATTERY YOU ARE USING TO JUMP START THE CAR HAS RECENTLY BEEN
CHARGED AND IS GASSING, COVER THE VENT PLUGS OR COVERS WITH A DAMP CLOTH
TO REDUCE THE RISK OF EXPLOSION SHOULD ARCING OCCUR WHEN CONNECTING THE
JUMP LEADS.

Turn off all electrical circuits such as radio, lights, indicators
etc. If the reason for a flat battery is unknown the condition may be as
a result of an electrical short circuit, so care must be taken during
the Jump-start process and subsequent to connection to ascertain if this
is the case. If this condition exists even with the electrical ancillaries
turned off,this can cause arcing when the jump leads are connected, a
small 'crackle' is normal but any spark or flash is an indication of a
problem that should be isolated before attempting to Jump-Start the
vehicle.

Jaguar do not recommended that the vehicle is jump started, however there
are obviously occasions when this is the only practical way to mobilise the
vehicle. If at all possible it is preferable to replace the flat battery
with a suitable fully charged unit rather than jump-start the car.

If there is no option but to jump-start the discharged battery should be
removed and recharged immediately after jump starting to avoid permanent
damage.

High quality, heavy duty Jump leads must be used as the current
consumption during starting is very high, and a voltage loss will be
exhibited though the jump leads, increasing current requirement. Make
sure that the slave battery is of the same voltage as the vehicle
battery, and suitable to provide the required starting current.

MAKE SURE THAT THE ENDS OF THE JUMP LEADS DO NOT TOUCH EACH OTHER OR
GROUND AGAINST THE VEHICLE BODY AT ANY TIME WHILE THE LEADS ARE
ATTACHED TO THE BATTERY. ARCING AND VERY RAPID DISCHARGE CAN CAUSE THE
BATTERY TO EXPLODE.

Connect the jump leads in the following sequence. Slave battery
positive first then vehicle battery positive. Slave battery negative and
then vehicle negative to a suitable vehicle ground point at least,
300 mm (12 in) from the battery terminal e.g. engine lifting
bracket, do not connect it directly to the vehicle battery.

Do not attempt continued repeated starting of the vehicle, this will
cause heat build up at the terminals and though the jump leads degrading
the leads performance and adding to voltage loss. Allow 3-4 minutes
recovery time for the leads and slave battery between starting attempts.

Once started reduce the engine speed to idle before disconnecting the
jump leads, switch on the heater blower (high) or the heated rear screen,
to reduce the alternator voltage peak when the leads are removed, as this
can damage electronic equipment. Disconnect the jump leads in the
reverse order to the connecting sequence taking great care not to
short the ends of the leads.

Do not rely on the alternator to restore a discharged battery. Ensure
that the battery is recharged or replaced with a new fully recharged unit
as soon as possible.

Following Jump-starting of a completely discharged battery, carry
out a
Green ECM drive Cycle This will allow the power train control module
to 're-learn' idle values.